A job advert to recruit 30 female train drivers in Saudi Arabia has attracted 28,000 applicants, highlighting the scale of pent up demand as the conservative kingdom opens up more opportunities to women. Spanish railway operator Renfe said on Wednesday an online assessment of academic background and English language skills had helped it to reduce the number of candidates by around a half, and it would work through the rest by mid-March. The 30 selected women will drive bullet trains between the cities of Mecca and Medina after a year of paid training. Renfe, which said it was keen to create op…